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Author	Thread
Hiroki Paranoid (IV) Inmate From: NZ Insane since: Dec 2002	posted 11-06-2003 04:38 Hi, guys. How are you? I am strugling calculating values of text box. I generated input text boxes inside of the loop. They are named price and quant. Then I wanted to do like price * quant = cost when I click calcualte button, you know. and print on the page. But some reason, it just say: NaN, NaN, Nan...... Hmm.....Here is my code: code: <html> <head> <title>Shop Form</title> <script type="text/javascript"> function calculate(){ var price = parseInt(document.theForm.price.value); var quant = parseInt(document.theForm.quant.value); var total = 0; for(i=1; i<=10; i++){ total=price*quant; document.write(total); } } </script> </head> <body> <form name="theForm"> <script type="text/javascript"> for(i=1; i<=10; i++){ document.write("<input type='text' name='price' value='0'>" ); document.write("<input type='text' name='quant' value='0'>" ); document.write("<br >"); } </script> <input type="button" onClick="calculate()" value="Get total"> </form> </body> </html> I haven't done JavaScript for a while..... Easy to forget........... Help. Hiroki Kozai
Yossi Admon Bipolar (III) Inmate From: Israel Insane since: Nov 2001	posted 11-06-2003 19:42 1) You refer to document.theForm.price.value / document.theForm.quant.value where you actually have 10 instances per each name therefore you should refer to the elements as following: var prices = document.getElementsByName("price"); var quants = document.getElementsByName("quant"); and during the iteration you can get the values of the ?price? and ?quant? by using the var price = parseInt(prices.item(i-1).value); var quant = parseInt(quants.item(i-1).value); 2) You are trying to write the total using the document.write(total); which will illuminate the whole document content and you will get runtime exception for referring nonsexist elements. You can define another text box for the total (document.write("<input type='text' name='total' value='' disabled>" ) and put the result into.
Hiroki Paranoid (IV) Inmate From: NZ Insane since: Dec 2002	posted 11-06-2003 21:05 Hi, Yossi. Thank you very much. It worked! Have a good day , mate. Cya. Hiroki Kozai

Topic awaiting preservation: Calculation problem\$

Author

Thread

Hiroki
Paranoid (IV) Inmate

From: NZ
Insane since: Dec 2002

posted 11-06-2003 04:38

Hi, guys. How are you?
I am strugling calculating values of text box.
I generated input text boxes inside of the loop.
They are named price and quant.
Then I wanted to do like price * quant = cost when I click calcualte button, you know.
and print on the page.
But some reason, it just say: NaN, NaN, Nan......
Hmm.....Here is my code:

code:

<html>

<head>

<title>Shop Form</title>

<script type="text/javascript">

 function calculate(){

 	var price = parseInt(document.theForm.price.value);

	var quant = parseInt(document.theForm.quant.value);

	var total = 0;

	for(i=1; i<=10; i++){

		total=price*quant;

		document.write(total);

	}

 }

</script>

</head>

<body>

<form name="theForm">

<script type="text/javascript">

for(i=1; i<=10; i++){

document.write("<input type='text' name='price' value='0'>" );

document.write("<input type='text' name='quant' value='0'>" );



document.write("<br >");

}

</script>

<input type="button" onClick="calculate()" value="Get total">

</form>

</body>

</html>

I haven't done JavaScript for a while.....
Easy to forget...........
Help.

Hiroki Kozai

Yossi Admon
Bipolar (III) Inmate

From: Israel
Insane since: Nov 2001

posted 11-06-2003 19:42

1) You refer to document.theForm.price.value / document.theForm.quant.value where you actually have 10 instances per each name therefore you should refer to the elements as following:
var prices = document.getElementsByName("price");
var quants = document.getElementsByName("quant");
and during the iteration you can get the values of the ?price? and ?quant? by using the
var price = parseInt(prices.item(i-1).value);
var quant = parseInt(quants.item(i-1).value);

2) You are trying to write the total using the document.write(total); which will illuminate the whole document content and you will get runtime exception for referring nonsexist elements. You can define another text box for the total (document.write("<input type='text' name='total' value='' disabled>" ) and put the result into.

Hiroki
Paranoid (IV) Inmate

From: NZ
Insane since: Dec 2002

posted 11-06-2003 21:05

Hi, Yossi. Thank you very much.
It worked!
Have a good day , mate.
Cya.

Hiroki Kozai